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Where did I mistaken? (correcting grammar mistake from previous one)

If:
Potential applied be V
Mass and charge of electron be M_e & e
Initial Velocity of system be u
Velocity Gained by electron be ~v
Initial energy of electron in system be U
Final energy of electron after acceleration be E
Energy gained by electron due to electric field be ~E
We have:
U = 1 / 2 M_e * u^2
~E = e * V
1 / 2 M_e * ~v ^ 2 = e * V ----For an observer in motion with system
E = 1 / 2 M_e * ( u + ~v )^2
E = 1 / 2 M_e * (u) ^ 2 + 1 / 2 M_e * (~v)^2 + M_e * u * ~v
E = U + ~E + M_e * u * ~v
Hence, the net energy is greater by M_e * u * ?v
Now, the question is where had energy came from?

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I don't know what all that crap under your question has to do with grammar, but of course, you must know that your question uses bad grammar?!

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I think the energy comes from the same place the crap he's asking comes from
his azz!
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I concur.
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Haha Good morning! :)
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Is it?
Hi.
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Sorry, I am not that smart.

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Not the devil...his time isn't spent with such details.. but maybe the energy comes from
the overlord devil?